Carbureter.



H. G- ROTH.

OARBURETER.

APPLICATION FILED JULY 29, 1911.

1 %5 61 3 Patenta Nov. 26, 1912.

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HARRIS G. ROTH, OF CHICAGO, ILLINOIS.

CARIBURETER.

Specification of Letters Patent.

Patented Nov. 26, 1912.

Application filed July 29, 1911. Serial No. 641,310.

To all whom it may concern: Be it known that I, HARRIS C. Born, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Carbureters for Explosive- Engines, of which the following is a complete specification.

The present invention relates to carbureters for explosive engines, and includes an improved construction and arrangement whereby the quantity and quality of the mixture are automatically and positively controlled. A single actuated mechanism is provided which will control the degree of opening of the port through which the mixture escapes to the engine, the degree of opening of the air inlet and the air passageway in which the oil inlet is located, and will maintain a definite opening ratio between the several openings.

The preferred construction of the improvement is illustrated in the accompanying drawings, in which Figure 1' is a vertical section of a carbu-- elevation of t e carbureter, showing more clearly the operating levers for same; Fig. 4 is a transverse section of the carbureter taken on the line 44 of Fig. 3; Fig. 5 is a detail perspective of the parts constituting the chief novel features of the improvement; and Figs. 6 and 7 are views illustrating certain details of construction of same.

The carbureter body is comprised of the two parallel side plates 1, 1, which are secured at their upper ends to head 3, preferably by means of the screws 4, as shown in Fig. 3. The carbureter head 3 is designed to be secured to the engine cylinder (not shown) by means of suitable bolts (not shown) engaging the holes 5. The said head 3 is provided with an opening or port 6, through which the mixture is drawn into the engine. This port, as shown in Fig. 2, is rectangular on the lower side of the head, but merges into a circular opening above.

Between the plates 1, l are hinged on the pins 7, 7 the oppositely disposed coact-ing plates 8, 8, which terminate at their upper ends adjacent the mixture port 6, forming an adjustable closure for same. The ends of the plates 8 are preferably made with the outwardly curved portions 9. As the plates swing to or from each. other they will close or open the port 6. The under side of the head 3, where the curved. portions 9 of the plates contact, is provided with a corresponding curve 3, so that practically an air tight fit is obtained here as well as between the said plates and side walls 1, 1. The plates 8 are formed with the corresponding opposite outwardly curved portions 10, 10, the corresponding opposite inwardly curved portions 11, 11, and near the upper ends the corresponding opposite outwardly curved portions 12, 12. That portion of the carbureter which lies within the walls 1 and between the portions 10, 10 of the plates 8 may be regarded as the air chamber 10; the corresponding space between the inwardly curved portions 11, 11 may be regarded as the contracted air passageway 11, in which the oil inlet is placed, and the corresponding space between the outwardly curved portions 12, 12 of the plate constitutes the carbureting chamber 12. The air inlet 13 lies between the hinge pins 7 of the plates 8 and is controlled by means of the hinged plates 14, 14, which constitute the air valve. These hinged plates are oppositely arranged; their hinge centers are coincident with that of the plates 8, 8 on the pins 7, 7, and the said plates are connected with each other through the toggle joint formed of the links 15. Secured to the joint pin 16 of the links 15 is the guide plate 17, slotted at 18 to engage the partition wall 19. The function of the said toggle joint and the slotted guide plate 17 is to connect the air valve plates 14 in such a manner that when closing or opening movement is imparted to one a corresponding movement will be imparted to the other. The air valve plates 14, as well as the mixture port closing plates 9, are actuated by a system of levers to be hereinafter described. Corresponding inward and outward movement of the plates 8, 8 is effected as follows: A shaft 20, parallel with the pins 7, has bearings in the walls 1 of the body and extends through the mixing chamber 12 between the plates 8. A lever 21, extending equal distances on each side of said shaft 20, is secured thereto, and the links 22 connect the ends of said lever to the plates 8', the arrangement being such that rotation of the shaft will cause the free ends of the plate to approach or recede from each other to effect the opening or closing of the mixture port 6.

In the contracted air passageway 11', be-

tween the inwardly curved portions 11 of the plates 8, is the oil inlet 23, which extends in a direction parallel to the said plates. The oil inlet comprises a tubular conduit. or pipe 24, shouldered at 25 to engage the side walls 1, 1 and thus form a distance piece between said walls. The conduit 24 connects with the constant level cup 26 through the pipe 27. The constant level cup is provided with the float 28 which operates the oil admission valve 29, through the levers 30. The height of oil level is regulated by adjusting the fulcrums of the levers 30, which fulcrums are carried on the lower end of the adjusting rod 31. The constant level cup 26 is fed through the pipe 32 from a constant source of supply, not shown. The tubular conduit 24 of the oil inlet is surrounded by a shell 33,.the bore of the shell being slightly larger than the diameter of the conduit, so that a comparatively thin annular space or reservoir 34 is made to surround the said conduit and extend throughout the length thereof within the body of the carbureter. The conduit 24 is provided with the valve opening 35, controlled by the needle valve 36, said valve opening leading into the annular reservoir 34. The oil level in the constant level cup 26 is maintained at such a height that when the needle valve 36 is opened the oil will flow into the reservoir, but will not overflow through the longitudinally extending slots 37 which are formed in the upper side of said shell 33. The slots 37 are so situated that the air in passing at high velocity through the contracted passageway 11 will entrain a fine spray of oil drawn out of the oil inlet by the partial vacuum in the mixing chamber and thusefiect a thorough mixture of' same. The small quantity of oil which collects in the reservoir 34 when the needle valve is first opened will insure the initial charge being sufiiciently rich to effect an easy starting of the engine. After the engine is started the reservoir will be empty, the oil passing directly from the oil outlet 35 through the slots 37 into the mixing chamber.

The partition wall 19 extends from a position near the hinge pins 7 of the plates 8, 8 upwardly and midway between said plates, terminating at and being secured to the shell 33, thus dividing the air chamber 10 into two lateral compartments. The' function of the partition 19 is to furnish a support for the'guide plate 17 and to deflect equal quantities of a1r on either side of the oil inlet 23.

From the foregoing it will be seen that inward movement of the plates 8, 8 will opcrate to close the mixture discharge port and also diminish the size of the air passageway 11, while corresponding movement of the plates 14 will operate to close the air inlet 13. The construction and arrangement of the two pairs of plates are such that the than that of the mixture port, thus resulting v in the proper vacuum being maintained in the mixing chamber. A single system of levers is made to control the movements of the parts, so the results obtained are the control by single means of the mixture port, the air passageway and the air inlet and the maintaining of a definite opening ratio between these several parts.

The limiting positions of the two pairs of plates are made adjustable, and the plates or valves are operated by the following means: To the shaft 20 is secured the bell crank lever 38, having the horizontally extending arm 39 and the upwardly extending arm 40,

which connects with suitable means (not shown) to the lever' controlled by the operator. Movement of the arm 39 will rock the shaft 20, effecting movement of the plates 8, 8, the extent of movement of this arm being determined by means of the adjustable stops 41 and 42 (see Fig. 7). In the body of the carbureter, near the lower end thereof, is journaled the rock shaft 43, which is provided with the arm 44 on its end, as shown in dotted lines in Fig. 1, and the arm 45 intermediate of the length of said shaft. The arm 45 is provided with an arcuate slot 46 whose center of curvature is coincident with thepivot-al center 47 of the link 48 with the being rotatable in but held against longitudinal movement by the swivel standard.

51. By rotating the rod 50 the effective length of the arm 45 is controlled, and hence the extent of opening of the air valve plates 14 is regulated. Since the center of curvature of the 'slot 46 is coincident with the pivotal center of the link 48 with the plate 14 when in closed position of plate, adjustment of said block in the slot will affect the extent of movement of the plates but will not afiect their closed position. The lever 39 on the rock shaft 20 connects with the arm 44 on the rock shaft 43, so that movement of the arm 40 will effect movement of both airs of valve plates 8 8 and 14 14, thereby simultaneously controlling the mixture port 6, the air passage. 11 and the air inlet 13 by means of a single acting device.

In starting the engine the carbureter is adjusted by means of the threaded rod 50 to give the correct proportion of mixture for low speed, after which these proportions will be maintained, the ratio of valve openings and air passageway kept constant and the quality of the mixture held uniform for any degree of opening or engine speed.

'What I claim as my invention, and desire to secure by Letters Patent, is:

1. In a carbureter for explosive engines, in combination, a body formed with parallel sides and provided at its upper end with a mixture discharge port and at its lower end with an air inlet, two oppositely disposed coacting plates within said body, said plates being hinged at their lower ends, curved inwardly intermediate of their length to form a contracted air passageway and terminating at their upper ends adjacent the mixture discharge port thereby forming an adjustable closure for same, an oil inlet located in the air passageway between the inwardly curved portions of said plates which thus regulate the air velocity around the inlet, a valve for regulating the airinlet, and suitable mechanism arranged to simultaneously actuate the said hinged plates and air valve, substantially as described.

2. In a carbureter for explosive engines, in combination, a body formed with parallel sides and provided at its upper end with a mixture discharge port, a pair of opposed plates closely fitting within said body, said plates being curved inwardly intermediate of their length, hinged at their lower ends andterminating at their upper ends adjacent said port, an oil inlet in said body located between the inwardly curved portions of said plates, the plates thus forming adjustable walls of a mixing chamber above the oil inlet and adjustable walls of an air chamber below said inlet, a pair of adjustable downwardly projecting plates forming ing of the air inlet, the mixture port and the air passageway around the oil inlet and maintaining a definite opening ratio between the several openings, substantially as described.

3. In a carbureter for explosive engines, in combination, a body provided with a mixture discharge opening and an air inlet, a pair of upwardly extending coacting plates curved inwardly intermediate of their length and arranged to form with their free ends an adjustable closure for said mixture port, an oil inlet located in the passageway formed by the inwardly projecting portions of said plates, an air valve comprised of a pair of downwardly extending hinged plates, the hinge point being coincident with said first mentioned plates, a partition extending midway between the plates from their hinge centers upwardly to the said oil inlet, an adjustable system of levers -for positively operating the two pairs of hinge plates, and single means for actuating said system of levers, substantially as described.

HARRIS C. ROTH.

Witnesses:

J. C. WARNES, H. T. WARNES. 

